46 • Chapter 5: User Mode and Calibration HS-04 Operator’s Manual
6. Press and hold AIR until the screen prompts you to release it.
7. If the fresh air adjustment passes, the instrument returns to the AIR item in the GAS CAL
menu.
8. If the fresh air adjustment fails, “FAIL AIR” displays. Press and release POWER MODE to
acknowledge the failure. See page 70.
Performing a Span Adjustment in A-CAL
The A-CAL item only appears if E-CAL in User Mode is set to OFF (factory setting). If E-CAL
is set to ON, see page 50 for calibration instructions.
Preparing for Span Adjustment
To adjust the span on the HS-04, you need:
• Calibration gas cylinder
• 0.25 LPM fixed flow regulator
• Non-absorbent tubing
• Calibration cup
1. Confirm that the HS-04’s calibration gas value matches the concentration listed on the
calibration gas cylinder as described on page 53.
Table 9: Calibration Concentration Limits
Channel
Min. Cal.
Concentration
Max. Cal.
Concentration
Hydrogen Sulfide 1.0 ppm 200.0 ppm
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